defmodule DaisyUIComponents.Form do
  @moduledoc """
  Form component helpers
  """

  use DaisyUIComponents.Component

  import DaisyUIComponents.Icon
  import DaisyUIComponents.Input

  @doc """
  Renders a label.
  """
  attr :class, :any, default: nil
  attr :for, :string, default: nil
  attr :type, :string, default: "label", values: ~w(label span)
  attr :rest, :global
  attr :label, :string, default: nil
  slot :inner_block

  def label(assigns) do
    ~H"""
    <label class={join_classes("label", @class)} for={@for} {@rest}>
      <span :if={@label} class="label-text"><%= @label %></span>
      <%= render_slot(@inner_block) %>
    </label>
    """
  end

  @doc """
  Renders an input with label and error messages.

  A `%Phoenix.HTML.Form{}` and field name may be passed to the input
  to build input names and error messages, or all the attributes and
  errors may be passed explicitly.

  ## Examples

      <.input field={@form[:email]} type="email" />
      <.input name="my-input" errors={["oh no!"]} />
  """
  attr :id, :any, default: nil
  attr :name, :any
  attr :label, :string, default: nil
  attr :value, :any

  attr :type, :string,
    default: "text",
    values: ~w(checkbox color date datetime-local email file hidden month number password
               range radio search select tel text textarea time url week)

  attr :field, Phoenix.HTML.FormField,
    doc: "a form field struct retrieved from the form, for example: @form[:email]"

  attr :class, :string, default: nil
  attr :bordered, :boolean, default: true
  attr :errors, :list, default: []
  attr :checked, :boolean, doc: "the checked flag for checkbox inputs"
  attr :prompt, :string, default: nil, doc: "the prompt for select inputs"
  attr :options, :list, doc: "the options to pass to Phoenix.HTML.Form.options_for_select/2"
  attr :multiple, :boolean, default: false, doc: "the multiple flag for select inputs"

  attr :rest, :global,
    include: ~w(autocomplete cols disabled form list max maxlength min minlength
                pattern placeholder readonly required rows size step)

  slot :inner_block

  def form_input(%{field: %Phoenix.HTML.FormField{} = field} = assigns) do
    assigns
    |> assign(field: nil, id: assigns.id || field.id)
    |> assign(:errors, Enum.map(field.errors, &translate(&1)))
    |> assign_new(:name, fn -> if assigns.multiple, do: field.name <> "[]", else: field.name end)
    |> assign_new(:value, fn -> field.value end)
    |> form_input()
  end

  def form_input(%{type: "checkbox"} = assigns) do
    assigns =
      assigns
      |> assign_new(:checked, fn ->
        Phoenix.HTML.Form.normalize_value("checkbox", assigns[:value])
      end)
      |> add_default_input_assigns()

    ~H"""
    <div class="form-control" phx-feedback-for={@name}>
      <.label class="cursor-pointer" for={@id}>
        <input type="hidden" name={@name} value="false" />
        <span class="label-text mr-2"><%= @label %></span>
        <.input
          id={@id}
          type="checkbox"
          name={@name}
          value="true"
          checked={@checked}
          class={@class}
          {@rest}
        />
        <.error :for={msg <- @errors}><%= msg %></.error>
      </.label>
    </div>
    """
  end

  def form_input(%{type: "select"} = assigns) do
    assigns = add_default_input_assigns(assigns)

    ~H"""
    <div class="form-control w-full" phx-feedback-for={@name}>
      <.label :if={@label} for={@id} label={@label} />
      <.input
        id={@id}
        type="select"
        name={@name}
        multiple={@multiple}
        class={@class}
        bordered={@bordered}
        {@rest}
      >
        <option :if={@prompt} value=""><%= @prompt %></option>
        <%= Phoenix.HTML.Form.options_for_select(@options, @value) %>
      </.input>
      <.error :for={msg <- @errors}><%= msg %></.error>
    </div>
    """
  end

  def form_input(assigns) do
    ~H"""
    <div class="form-control w-full" phx-feedback-for={@name}>
      <.label :if={@label} for={@id} label={@label} />
      <.input
        id={@id}
        class={@class}
        type={@type}
        name={@name}
        value={Phoenix.HTML.Form.normalize_value(@type, @value)}
        bordered={@bordered}
        {@rest}
      />
      <.error :for={msg <- @errors}><%= msg %></.error>
    </div>
    """
  end

  defp add_default_input_assigns(assigns) do
    assigns
    |> assign_new(:color, fn -> assigns.errors != [] && "error" end)
    |> move_attr_to_rest(:color)
  end

  @doc """
  Generates a generic error message.
  """
  attr :show, :boolean, default: false
  slot :inner_block, required: true

  def error(assigns) do
    ~H"""
    <p class="mt-3 flex gap-3 text-sm leading-6 text-error phx-no-feedback:hidden">
      <.icon name="hero-exclamation-circle-mini" class="mt-0.5 h-5 w-5 flex-none" />
      <%= render_slot(@inner_block) %>
    </p>
    """
  end
end